/******************************************************
Sessions

(c) 1996 Innobase Oy

Created 6/25/1996 Heikki Tuuri
*******************************************************/

#ifndef usr0sess_h
#define usr0sess_h

#include "univ.i"
#include "ut0byte.h"
#include "trx0types.h"
#include "srv0srv.h"
#include "trx0types.h"
#include "usr0types.h"
#include "que0types.h"
#include "data0data.h"
#include "rem0rec.h"

/*************************************************************************
Opens a session. */

sess_t *sess_open(void);
/*============*/
/* out, own: session object */
/*************************************************************************
Closes a session, freeing the memory occupied by it, if it is in a state
where it should be closed. */

ibool sess_try_close(
    /*===========*/
    /* out: TRUE if closed */
    sess_t *sess); /* in, own: session object */

/* The session handle. All fields are protected by the kernel mutex */
struct sess_struct
{
  ulint state; /* state of the session */
  trx_t *trx;  /* transaction object permanently
               assigned for the session: the
               transaction instance designated by the
               trx id changes, but the memory
               structure is preserved */
  UT_LIST_BASE_NODE_T(que_t)
  graphs; /* query graphs belonging to this
          session */
};

/* Session states */
#define SESS_ACTIVE 1
#define SESS_ERROR                       \
  2 /* session contains an error message \
    which has not yet been communicated  \
    to the client */
#ifndef UNIV_NONINL
#include "usr0sess.ic"
#endif

#endif
